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Sinus
From Wikipedia, the free encyclopedia
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Sinus may refer to:
Contents
Anatomy
In anatomy, where a sinus is a sac or cavity in any organ or tissue:
Sinus (anatomy), description of the general term
Paranasal sinuses, air cavities in the cranial bones, especially those near the nose, including:
the
maxillary sinuses, also called the maxillary antra and the largest of the paranasal sinuses, are under the eyes, in the maxillary bones.
the
frontal sinuses, superior to the eyes, in the
frontal bone, which forms the hard part of the
forehead.
the
ethmoid sinuses, which are formed from several discrete air cells within the ethmoid bone between the nose and the eyes.
the
sphenoid sinuses, in the
sphenoid bone at the center of the skull base under the
pituitary gland.
Anal sinuses, the furrows which separate the columns in the rectum
Dural venous sinuses, venous channels found between layers of dura mater in the brain
In the heart:
Sinus node, a structure in the superior part of the right atrium
Sinus rhythm, normal beating on an ECG
Coronary sinus, a vein collecting blood from the myocardium
Sinus venosus, a cavity in the heart of embryos
Sinus venarum, a part of the wall of the right atrium in adults, developed from the sinus venosus
Other:
Sinus (botany), a space or indentation, usually on a leaf
Mathematics
Sine a trigonometric math function (Latin sinus)